TSP Loan Calculator
Estimate your payments and total interest for a Thrift Savings Plan loan.
The amount you wish to borrow. Minimum is $1,000.
The TSP loan rate is the G Fund’s interest rate from the previous month.
1-5 years for a general purpose loan, up to 15 years for a primary residence loan.
How often your loan payments will be deducted from your paycheck.
What is a TSP Loan Calculator?
A TSP Loan Calculator is a financial tool designed specifically for federal employees and members of the uniformed services who participate in the Thrift Savings Plan (TSP). This calculator helps you estimate the financial implications of taking a loan from your TSP account. By inputting the desired loan amount, interest rate, and repayment term, you can see your estimated periodic payment, the total interest you’ll pay back into your own account, and a complete amortization schedule. This tool is essential for making an informed decision before borrowing against your retirement savings.
Unlike a traditional bank loan, a TSP loan allows you to borrow from yourself. The interest you pay doesn’t go to a lender; it goes right back into your own TSP account. Our TSP Loan Calculator helps demystify this process, giving you a clear picture of your repayment obligations.
TSP Loan Calculator Formula and Explanation
The calculation for a TSP loan payment is based on the standard amortization formula used for most installment loans. The calculator determines your periodic payment, which is the fixed amount deducted from your paycheck.
The formula is:
P = L * [r(1+r)^n] / [(1+r)^n – 1]
This formula ensures that each payment covers the interest accrued since the last payment, with the remainder reducing the loan principal. Our TSP Loan Calculator automates this complex calculation for you.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| P | Periodic Payment Amount | Currency (e.g., $) | Varies based on inputs |
| L | Loan Principal Amount | Currency (e.g., $) | $1,000 – $50,000 |
| r | Periodic Interest Rate | Percentage (%) | Annual Rate / Payments per Year |
| n | Total Number of Payments | Count | 12 – 180 |
Practical Examples
Example 1: General Purpose Loan
A federal employee needs to borrow money for a home renovation project. They decide to take a general purpose TSP loan.
- Inputs:
- Loan Amount (L): $15,000
- Interest Rate: 4.5%
- Loan Term: 5 years (60 months)
- Pay Frequency: Monthly (12 payments/year)
- Results from the TSP Loan Calculator:
- Monthly Payment (P): $279.78
- Total Interest Paid: $1,786.80
- Total Repayment: $16,786.80
Example 2: Shorter Term Loan
A uniformed service member needs quick access to funds for an unexpected expense and wants to pay it back quickly.
- Inputs:
- Loan Amount (L): $5,000
- Interest Rate: 4.5%
- Loan Term: 2 years (24 months)
- Pay Frequency: Bi-Weekly (26 payments/year, so 52 total payments)
- Results from the TSP Loan Calculator:
- Bi-Weekly Payment (P): $100.32
- Total Interest Paid: $216.64
- Total Repayment: $5,216.64
How to Use This TSP Loan Calculator
Our calculator is designed for ease of use. Follow these simple steps to estimate your loan payments:
- Enter Loan Amount: Input the total amount you wish to borrow from your TSP account. The minimum is $1,000.
- Set the Interest Rate: Enter the current TSP loan interest rate. This is equal to the G Fund’s interest rate from the month prior to your application.
- Define the Loan Term: Specify the number of years you plan to take to repay the loan. General purpose loans have a term of 1-5 years, while residential loans can be up to 15 years.
- Select Pay Frequency: Choose how often you receive a paycheck (bi-weekly, monthly, etc.). This determines the number of payments per year and affects the payment amount.
- Review Your Results: The calculator will instantly display your estimated periodic payment, total interest paid back to your account, and total repayment amount. An amortization schedule and a visual chart are also generated for a detailed breakdown.
Key Factors That Affect a TSP Loan
- G Fund Interest Rate: The loan’s interest rate is not arbitrary; it’s tied directly to the G Fund’s performance. A higher G Fund rate means a higher interest rate on your loan.
- Loan Term: A longer term will result in lower periodic payments but will increase the total amount of interest you pay over the life of the loan. A shorter term means higher payments but less total interest.
- Outstanding Loan Balance: The maximum you can borrow is capped at $50,000 and is also limited by any outstanding TSP loan balance you’ve had in the past 12 months.
- Vested Account Balance: You can only borrow against your own contributions and their earnings. Agency contributions do not count towards your loan eligibility until they are vested.
- Opportunity Cost: The money you borrow is taken out of your investment funds. This means it is not earning market returns, which could be higher than the loan interest rate you are paying back. This is a critical factor to consider in your retirement planning.
- Separation from Service: If you leave federal service with an outstanding loan, you must decide whether to pay it off immediately, continue making payments, or have it declared a taxable distribution, which can have significant tax consequences.
Frequently Asked Questions (FAQ)
What is the interest rate on a TSP loan?
The interest rate is fixed for the life of the loan and is set to the rate of the Government Securities Investment (G) Fund from the month before you applied for the loan.
Does a TSP loan affect my credit score?
No. Since you are borrowing from your own savings, a TSP loan is not reported to credit bureaus and does not impact your credit score.
How much can I borrow from my TSP?
The minimum is $1,000. The maximum is the lesser of $50,000 (minus any highest outstanding loan balance in the last 12 months), or 50% of your vested account balance.
How is a TSP loan repaid?
Repayments are made automatically through payroll deductions. The payment amount is calculated to ensure the loan is paid off within your chosen term.
Can I have more than one TSP loan?
Yes, you can have up to two loans outstanding at one time, but only one can be a primary residence loan.
What is the difference between a general purpose and a residential loan?
A general purpose loan can be used for anything, requires no documentation, and has a 1-5 year term. A residential loan is only for the purchase or construction of a primary residence, requires documentation, and can have a term up to 15 years.
What happens if I leave my federal job with an outstanding loan?
You must either repay the loan in full by the deadline, set up a plan to continue making monthly payments, or the outstanding balance will be treated as a taxable distribution, potentially incurring income tax and a 10% early withdrawal penalty.
Where does the interest I pay go?
One of the unique benefits of a TSP loan is that the interest you pay is deposited directly back into your own TSP account, essentially paying yourself interest.